The X-ray Properties of M101 ULX-1 = CXOKM101 J140332.74+542102

We report our analysis of X-ray data on M101 ULX-1, concentrating on high state Chandra and XMM-Newton observations. We find that the high state of M101 ULX-1 may have a preferred recurrence timescale. If so, the underlying clock may have periods around 160 or 190 days, or possibly around 45 days. Its short-term variations resemble those of X-ray binaries at high accretion rate. If this analogy is correct, we infer that the accretor is a 20-40 Msun object. This is consistent with our spectral analysis of the high state spectra of M101 ULX-1, from which we find no evidence for an extreme (> 10^40 ergs/s) luminosity. We present our interpretation in the framework of a high mass X-ray binary system consisting of a B supergiant mass donor and a large stellar-mass black hole.Comment: 23 pages, 7 figures, accepted for publication in the Astrophysical Journa

Systems, interactions and macrotheory

A significant proportion of early HCI research was guided by one very clear vision: that the existing theory base in psychology and cognitive science could be developed to yield engineering tools for use in the interdisciplinary context of HCI design. While interface technologies and heuristic methods for behavioral evaluation have rapidly advanced in both capability and breadth of application, progress toward deeper theory has been modest, and some now believe it to be unnecessary. A case is presented for developing new forms of theory, based around generic “systems of interactors.” An overlapping, layered structure of macro- and microtheories could then serve an explanatory role, and could also bind together contributions from the different disciplines. Novel routes to formalizing and applying such theories provide a host of interesting and tractable problems for future basic research in HCI

Jane Roe Gone Rogue: Norma McCorvey’s Transformation as a Symbol of the U.S. Abortion Debate

This thesis explores the evolution of Norma McCorvey (1947-2017), better known as “Jane Roe” of Roe v. Wade, as a symbol of the United States abortion debate. I trace her life from her childhood through her death, examining her decision to become the Roe plaintiff, rise to fame as a symbol of the pro-choice movement, defection to the pro-life movement, subsequent attempts to reverse the Roe decision, and memorializations by various political figures and media outlets. I examine the role that her poverty, education, non-normative sexuality, and whiteness played in the public construction of her as an unreliable figurehead. To make sense of her unconventional political trajectory as well as the spetacularizing media attention she drew over the course of her life, I engage with journalistic and scholarly writing about her, her two co-authored memoirs, and audiovisual representations of her life and activist work. Ultimately, I contest the caricaturization of McCorvey as “the ultimate victim,” a financial opportunist, and “white trash” by contextualizing the challenges she faced due to her class, sexuality, and the shifting rhetoric on abortion between 1970-2017

Implications of Personal Recovery History for Training and Development of Addiction Treatment Workers

The purpose of the study was to identify and compare competencies perceived as most important by addiction treatment workers with, and without, a personal history of recovery. A survey was developed and administered to 94 workers in three community-based addiction treatment agencies. The study found broad support for the competencies published by the Addiction Technology Transfer Center, National Curriculum Committee (1998). There were no significant differences in perceptions of competencies by workers with a personal recovery history and those without such history. Results indicate that factors such as workplace culture may be more powerful than recovery history in influencing worker perceptions. Areas for improved training, such as utilization of research, outcome studies, and applying systems theory, are discussed

The molecular cloning and characterisation of cDNA coding for the alpha subunit of the acetylcholine receptor

The published version of this article is available at Oxford Journals in Nucleic Acids Research at http://nar.oxfordjournals.org/content/10/19/5809.full.pdf+htmlA rare cDNA coding for most of the α subunit of the Torpedo nicotinic acetylcholine receptor has been cloned into bacteria. The use of a mismatched oligonucleotide primer of reverse transcriptase facilitated the design of an efficient, specific probe for recombinant bacteria. DNA sequence analysis has enabled the elucidation of a large part of the polypeptide primary sequence which is discussed in relation to its acetylcholine binding activity and the location of receptor within the plasma membrane. When used as a radioactive probe, the cloned cDNA binds specifically to a single Torpedo mRNA species of about 2350 nucleotides in length but fails to show significant cross-hybridisation with a subunit mRNA extracted from cat muscle

Oxidation Behavior of a Pd_(43)Cu_(27)Ni_(10)P_(20) Bulk Metallic Glass and Foam in Dry Air

The oxidation behavior of both Pd_(43)Cu_(27)Ni_(10)P_(20) bulk metallic glass (Pd4-BMG) and its amorphous foam containing 45 pct porosity (Pd4-AF) was investigated over the temperature range of 343 K (70 °C) to 623 K (350 °C) in dry air. The results showed that virtually no oxidation occurred in the Pd4-BMG at T < 523 K (250 °C), revealing the alloy’s favorable oxidation resistance in this temperature range. In addition, the oxidation kinetics at T ≥ 523 K (250 °C) followed a parabolic-rate law, and the parabolic-rate constants (k_p values) generally increased with temperature. It was found that the oxidation k_p values of the Pd4-AF are slightly lower than those of the Pd4-BMG, indicating that the porous structure contributes to improving the overall oxidation resistance. The scale formed on the alloys was composed exclusively of CuO at T ≥ 548 K (275 °C), whose thickness gradually increased with increasing temperature. In addition, the amorphous structure remained unchanged at T ≤ 548 K (275 °C), while a triplex-phase structure developed after the oxidation at higher temperatures, consisting of Pd_2Ni_2P, Cu_3P, and Pd_3P